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A method of doping with yttrium to induce crystal transformation of bismuth oxide to improve its photocatalytic effect

A technology of crystal transformation and bismuth oxide, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low migration efficiency and easy recombination of photogenerated carriers , Utilization rate is not high, to overcome the effects of easy compounding, high light energy utilization efficiency, and low cost

Inactive Publication Date: 2016-08-10
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from traditional doping modification, this technology focuses on metal doping to induce crystal transformation of the catalyst, creating artificial dislocations and steps with moderate heterocrystals to form more oxygen vacancies and defect sites, which can Overcoming the disadvantages of photogenerated carriers in traditional synthetic photocatalysts, such as easy recombination, low migration efficiency, and low utilization rate, to achieve efficient visible light utilization efficiency

Method used

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  • A method of doping with yttrium to induce crystal transformation of bismuth oxide to improve its photocatalytic effect
  • A method of doping with yttrium to induce crystal transformation of bismuth oxide to improve its photocatalytic effect
  • A method of doping with yttrium to induce crystal transformation of bismuth oxide to improve its photocatalytic effect

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Dissolve 66 grams of bismuth nitrate in 500 grams of absolute ethanol, adjust the acidity to pH 1-2 with commercially available 38% concentrated nitric acid, and add 8.5 grams of cetyltrimethylammonium bromide as a dispersant. Stir slowly until complete dissolution and store at room temperature for 24 hours to achieve seed induction. Add 7 grams of yttrium nitrate into 10 ml of nitric acid aqueous solution with a mass concentration of 10%, slowly heat until completely dissolved, slowly add this solution into the aforementioned bismuth nitrate solution, keep stirring, and control the stirring speed at 200 rpm until completely dispersed , a pale orange-yellow suspension was formed, and stirring was continued at room temperature for 3 hours. The obtained solution was transferred to a high-temperature crystallization kettle with a polytetrafluoroethylene liner, sealed and stored in an oven, and the temperature of the oven was set at 150°C. After 24 hours, the obtained preci...

Embodiment 2

[0027] Dissolve 73 grams of bismuth nitrate in 500 grams of absolute ethanol, adjust the acidity to pH 1-2 with commercially available 38% concentrated nitric acid, add 10.2 grams of cetyltrimethylammonium bromide, and stir slowly until completely dissolved , preserved for 24 hours; 5 grams of yttrium nitrate was added in 10 milliliters of 10% nitric acid aqueous solution, heated to dissolve, slowly added to the aforementioned bismuth nitrate solution, stirred and dispersed to form a light orange-yellow suspension, and after continuous stirring for 3 hours, Transfer to a crystallization kettle, crystallize at 150°C for 24 hours, and the obtained precipitate is filtered, washed, dried, and calcined at 500°C for 3 hours to obtain a bismuth oxide photocatalyst induced by yttrium doping to achieve crystal transformation. Details of the remaining synthesis steps and activity evaluation steps are the same as in Example 1.

[0028] The photocatalyst identified by X-ray diffraction is...

Embodiment 3

[0030] Dissolve 106 grams of bismuth nitrate in 500 grams of absolute ethanol, adjust the acidity to pH 1-2 with commercially available 38% concentrated nitric acid, add 11.7 grams of cetyltrimethylammonium bromide, and stir slowly until completely dissolved , stored for 24 hours; 10 grams of yttrium nitrate was added in 10 milliliters of 10% nitric acid aqueous solution, heated to dissolve, slowly added to the aforementioned bismuth nitrate solution, stirred and dispersed to form a light orange-yellow suspension, and after continuous stirring for 3 hours, Transfer to a crystallization kettle, crystallize at 150°C for 24 hours, and the obtained precipitate is filtered, washed, dried, and calcined at 575°C for 3 hours to obtain a bismuth oxide photocatalyst induced by yttrium doping to achieve crystal transformation. Details of the remaining synthesis steps and activity evaluation steps are the same as in Example 1.

[0031] The obtained photocatalyst was identified by X-ray di...

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Abstract

The invention relates to a doping technology based method for promoting crystal transformation of a photocatalyst to improve the photocatalytic activity, and belongs to the field of environmental photocatalysis materials. The specific technical scheme is as below: first preparing a bismuth oxide precursor solution, then adding a proper amount of yttrium salt as an inducing factor, conducting solvothermal synthesis at high temperature, and calcining the obtained products to realize the crystallization and crystal transformation, so as to improve the photocatalytic activity. The invention has the advantage that the bismuth oxide catalyst preparation process using yttrium doping induction to realize crystal transformation has simpleness, mild condition and low cost, and can overcome the disadvantages in a traditional synthetic catalyst such as easy compound of photon-generated carrier, low migration efficiency, low utilization rate and weak responding ability to visible light, and realize high luminous energy utilization efficiency.

Description

technical field [0001] The invention relates to a method for promoting photocatalyst to realize crystal transformation by doping technology to improve its photocatalytic activity, and belongs to the field of environmental photocatalytic functional materials. Background technique [0002] Semiconductor-based photocatalytic degradation of organic pollutants has attracted great attention in recent years because it offers many potential solutions to environmental problems. Many traditional semiconductor materials, including titanium dioxide and zinc oxide, exhibit high photosensitivity, non-toxicity, and low cost, but these catalysts can only absorb about 4% of sunlight in ultraviolet or near-Earth ultraviolet radiation. Therefore, the development of new visible-light photocatalysts is currently a hotspot in environmental photocatalysis research, and it is also a challenging work. [0003] Bismuth oxide is one of the most important bismuth compounds. Because of its various cry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18C02F1/30
Inventor 殷立峰代云容
Owner BEIJING NORMAL UNIVERSITY